Exciton-Exciton Interaction in CdS, CdSe, and ZnO

Magde, Douglas; Mahr, H.

doi:10.1103/physrevlett.24.890

Cited by 117 publications

(22 citation statements)

References 14 publications

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“…(c) and (d) Fitted spectra showing the individual peak contributions for the lowest and highest excitation power, respectively discussion in Section 2, this behavior does not follow the typical trend for bound excitons [65], being more consistent with biexcitonic emission [81,82]. However, the spectral position of this peak does not match previous reports of biexcitons in bulk CdSe [58,66]. Moreover, by plotting the PL intensity of S, U, and V as a function of P (Fig.…”

Section: Seeded-grown Nanowiresmentioning

confidence: 63%

“…Hence, their relative intensity compared to free-excitons decreases for higher power [65]. The opposite happens for biexcitonic emission [65,66]. Since this requires interaction between two excitons, its intensity depends on n 2 (n being the density of photoexcited excitons), and therefore increases faster than that of free-excitons for increasing excitation power [65,66].…”

Section: Familymentioning

confidence: 99%

“…The opposite happens for biexcitonic emission [65,66]. Since this requires interaction between two excitons, its intensity depends on n 2 (n being the density of photoexcited excitons), and therefore increases faster than that of free-excitons for increasing excitation power [65,66]. Excitons can often be bound at donor or acceptor sites, either charged or neutral [63].…”

Section: Familymentioning

confidence: 99%

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Photoluminescence of CdSe nanowires grown with and without metal catalyst

et al. 2011

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We present temperature and power dependent photoluminescence measurements on CdSe nanowires synthesized via vapor-phase with and without the use of a metal catalyst. Nanowires produced without a catalyst can be optimized to yield higher quantum efficiency, and narrower and spatially uniform emission, when compared to the catalyst-assisted ones. Emission at energies lower than the band-edge is also found in both cases. By combining spatially-resolved photoluminescence and electron microscopy on the same nanowires, we show that catalyst-free nanowires exhibit a low-energy peak with sharp phonon replica, whereas for catalyst-assisted nanowires low-energy emission is linked to the presence of nanostructures with extended morphological defects.

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Section: Seeded-grown Nanowiresmentioning

confidence: 63%

Section: Familymentioning

confidence: 99%

Section: Familymentioning

confidence: 99%

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Photoluminescence of CdSe nanowires grown with and without metal catalyst

et al. 2011

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“…An interpretation of the experiment from this point of view has been proposed for the first time in [22] for the explanation of a new luminescence band which was observed in CdS crystals excited by electron bombardment. I n the some manner the authors of [23] interpret their experimental results on the observation of an extra luminescence band in CdS, CdSe, and ZnO crystals under intense laser illumination. A new luminescence band appearing in ZnO under electron excitation has been also explained on this basis [24].…”

Section: A ] )mentioning

confidence: 94%

Effect of Exciton–Exciton Interaction on the Free Exciton Absorption and Luminescence Spectra of Si and CdS Crystals under High Intensity Excitation

Lelyakov¹

1974

Physica Status Solidi (b)

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Lorentz shapes of the excitonic absorption and luminescence bands are obtained by Matsubara's Green's function technique in second order of the perturbation theory. The shapes of the excitonic absorption and luminescence bands are studied for the gaseous phase of free excitons in Si and CdS crystals under high intensity excitation. It is demonstrated that the elastic collisions of excitons lead to a broadening and shift of excitonic absorption and luminescence bands even when phonons are absent. The effect of phonons in the present case has not been taken into account.

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“…À part la recombinaison des biexcitons, d'autres raies apparaissent à forte intensité d'excitation. Des raies P, par exemple sont dues à des processus de collision exciton-exciton [47][48][49][50][51]. Comme le montre le processus P 2 de la figure 37, en obéissant aux lois de conservation d'énergie et de la quantité de mouvement, un b.i.p.…”

Section: Hole-burning Permanentunclassified

Méthodes expérimentales de l'optique non linéaire

Hönerlage

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : Dans cet article, nous discutons les différentes techniques et méthodes expérimentales utilisées en spectroscopic optique non linéaire. En particulier, nous considérons les changements d'absorption et de dispersion des matériaux soumis à une forte intensité d'excitation, des mesures de photoluminescence et de gain optique ainsi que du mélange à quatre ondes dans différentes configurations. Dans nos exemples, nous appliquons principalement ces méthodes à des semiconducteurs possédant des zones interdites directes et dipôles actives où des quasi-particules électroniques peuvent être excitées en résonance. Nous obtenons ainsi des informations sur leur durée de vie et de cohérence, les processus de collision et de relaxation d'énergie ainsi que sur les propriétés de transport de ces matériaux.

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Exciton-Exciton Interaction in CdS, CdSe, and ZnO

Cited by 117 publications

References 14 publications

Photoluminescence of CdSe nanowires grown with and without metal catalyst

Photoluminescence of CdSe nanowires grown with and without metal catalyst

Effect of Exciton–Exciton Interaction on the Free Exciton Absorption and Luminescence Spectra of Si and CdS Crystals under High Intensity Excitation

Méthodes expérimentales de l'optique non linéaire

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